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Measurement of the top quark mass using the invariant mass of lepton pairs in soft muon b-tagged events

T. Aaltonen et al. (CDF Collaboration)
Phys. Rev. D 80, 051104(R) – Published 8 September 2009

Abstract

We present the first measurement of the mass of the top quark in a sample of tt¯ν¯bb¯qq¯ events (where =e,μ) selected by identifying jets containing a muon candidate from the semileptonic decay of heavy-flavor hadrons (soft muon b tagging). The pp¯ collision data used correspond to an integrated luminosity of 2fb1 and were collected by the CDF II detector at the Fermilab Tevatron Collider. The measurement is based on a novel technique exploiting the invariant mass of a subset of the decay particles, specifically the lepton from the W boson of the tWb decay and the muon from a semileptonic b decay. We fit template histograms, derived from simulation of tt¯ events and a modeling of the background, to the mass distribution observed in the data and measure a top quark mass of 180.5±12.0(stat)±3.6(syst)GeV/c2, consistent with the current world average value.

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  • Received 29 June 2009

DOI:https://doi.org/10.1103/PhysRevD.80.051104

©2009 American Physical Society

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Vol. 80, Iss. 5 — 1 September 2009

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